JPS62189206A - Method for constructing bridge - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Field of Application) The present invention relates to a method for constructing a bridge, particularly a truss structure having a large span, piers and abutments, and mainly made of steel. This invention relates to a method of constructing a bridge having a bridge body.

(Prior art) For example, a bridge as shown in Fig. 10, ie, a bridge abutment 1.1
In the construction of a bridge, which has a bridge 11JI2.2 in between, and a truss structure bridge body 4 is erected over these abutments 1 and 2 piers via shoes 3.3...43, the conventional cable construction method is used. The overhang method is generally used.

Among them, the overhang method is used to construct the bridge body 4 as shown in Figure 11.
After the sections are erected using the construction supports 5, 5, etc., the bridge body is constructed by sequentially extending it to section B through section B while applying a force of 1 kunta to each section of the bridge body.

In addition, as an alternative method to the overhang construction method, as shown in Fig. 12, diagonal reliefs 6, 6 for erection are provided on the piers 2, and using these diagonal reliefs, the bridge body 4 is successively extended from side to side. (Refer to the publication, Civil Engineering IL Method-Za 3, Steel Bridge Superstructure Construction Method, Published by Sanshodo Co., Ltd.)

(Problems to be Solved by the Invention) However, the conventional overhang construction method described above has a major problem in that it requires a large amount of construction materials and equipment including shoring.

The reason for adopting the above construction method is that the shoes 3.3...
Since the bridge body 4 is supported by the bridge body 4 and the structure is to transmit this load to the abutments 1 and piers 2 of the substructure, the overhang method cannot be used if there is no bridge body or diagonal maintenance 6.6 in the side span that should act as a counter. Due to the fact that the adoption cannot be reversed.

Furthermore, when the construction of the entire tank is completed, it may be necessary to raise and lower the shoes 3 on the piers 2 in order to release the initial stress introduced during construction, but since the bridge body 4 is huge, the above The work involved is strenuous, dangerous, and extremely difficult.

In particular, during the erection of the bridge body in the above-mentioned overhanging work, the work is carried out with the bridge body temporarily fixed, so the A3 can be placed in an extremely dangerous situation under the load of an abnormality such as an earthquake or typhoon. There were various problems such as:

[Structure of the invention]

(Means for solving the problem) In order to solve the above problem, the bridge body is made of a truss structure made of members mainly made of steel, and the piers are made of concrete, etc. The connecting parts of the upper chord, lower chord, and diagonal members that make up the bridge body are fixed and completed on the left and right sides of the pier, and each component of the bridge body is sequentially connected to the joints completed on the left and right sides of the pier. It is characterized by overhanging construction and rigidly integrating the bridge body with the piers.

(Embodiment) The present invention will be described below with reference to the embodiment shown in FIGS. 1 to 9, using the same reference numerals for the same members as in FIGS. 10 to 12.

Figures 1 and 2 show the overall structure of a bridge constructed using the construction method according to the present invention. In consideration of the fact that the neighboring lower chord members will receive a very large compression force, the steel lower chord member is reinforced with reinforced concrete ]-7.

In the present invention, the upper chord member 8, the lower chord member 9,
Connecting portions 11, 12, and 13 for connecting the diagonal members 10 are integrally fixed.

FIGS. 3 to 5 show examples of the installation structure of the above-mentioned connecting portions 11, 12° 13.

In the case shown in the third figure, the upper chord connecting part 11.11 and the diagonal connecting part 13.13 are integrally formed on both sides of the upper part of the steel column 14, and the lower chord connecting part 12.12 is integrally formed on both sides of the lower part. During the construction stage of the pier 2, the pier 2 and the connecting member are integrated by embedding the steel column 14 portion within the pier 2, and upper chord connecting portions 11 are formed on both sides of the pier 2. 11, the pier structure is such that diagonal member connecting portions 13.13 and lower chord connecting portions 12.12 are respectively protruded.

In the case shown in Figure 71, anchor bolts 15.16 are buried at predetermined positions n during construction of the pier 2, and the upper chord connecting portions 11° 11 and the diagonal connecting portions 1 are attached to the anchor bolts 15.16.
3.13 and the lower chord connecting portions 12.12, the upper chord connecting portions 11.
11, diagonal member connecting portions 13, 13, and lower chord connecting portion 12
．． 12 is a pier structure with each protruding shape.

Furthermore, in the case shown in Fig. 5, a connecting member that integrally includes the upper chord connecting part 11. Each connecting portion is integrated with the bridge pier 2 by being connected to the anchor pole 1-15 buried in the bridge.

6 to 9 show the construction order in the case of constructing the bridge body 4 having a truss structure on the bridge pier 2 shown in the third figure.

The procedure for constructing the bridge body 4 is to first attach the upper ends of the diagonal members 10, 10 to the left and right diagonal member connecting portions 13.13 of the connecting portions integrally formed on the pier 2, as shown in Figure 7. While rigidly connecting, a lower chord member 9.9 is rigidly connected to the left and right lower chord connecting portions 12°12, and a connecting portion 9A formed at the tip of this lower chord member 9.9,
Rigidly connect the lower ends of the diagonal members 10 and 10 to 9A.

Next, from this state, one end of the upper chord member 8.8 is rigidly connected to the upper chord member joining parts 11.11 on the left and right sides of J: Urchin shown in Fig. 8, and each tip of the upper chord member 8.8 and the lower chord member 9.9 is connecting parts 8A, 8
A, Rigidly connect the vertical member 16°16 to 98.98.

After that, similarly to the beginning, the diagonal members 10.10 are rigidly connected to the connecting parts 8B, 8B at the tips of the lower chord members 8, 8, and the next lower chord 449.9 is rigidly connected to the tips of the lower chord members 9.9.
0.10 and the lower chord members 9.9, the bridge bodies 4 are successively extended to the left and right of the piers 2, and finally both piers 2 are attached at the center of the span O in Fig. 1. .Bridge body extended from 24. /I to complete the bridge between piers 2.2.

Also, the bridge body 4.4 extending on the opposite side of the pier 2.2 is connected to the abutment 1.1 to complete the bridge between the C pier 2, 2 and the abutment 1.1.

In addition, as shown in the second figure, the lower chord connecting portion 12 of the pier 2.
When reinforcing the lower chord t149,9 which is rigidly connected to 12 with reinforced concrete 7, after the lower chord members 9,9 are rigidly connected, a formwork is constructed, reinforcing bars are placed, and concrete is poured and hardened. Now we can begin the work of connecting the next lower chord member 9.

By doing this, the lower chord member 9 near the pier becomes a composite b'4 structure with concrete, and receives the greatest compression weight (
It is possible to maintain sufficient strength of the pulling part.

〔Effect of the invention〕

As explained above, the present invention provides a bridge structure in which the bridge body is a truss structure made of members mainly made of steel, and the bridge piers are made mainly of concrete, etc. , each connection part of the diagonal members is fixed and completed on the left and right sides of the pier, and each component of the bridge body is connected to the connection parts completed on the left and right sides of the pier, and the bridge body is stretched out one after another, and the bridge body is rigidly connected to the pier. Since the bridge was constructed by integrating the bridges, it was possible to significantly reduce the amount of construction materials and equipment that were indispensable when constructing bridges using the conventional overhang method.
The benefits obtained are extremely large.

In particular, when constructing the bridge body by extending it from the piers, it is not temporarily fixed as in conventional construction methods, but is completely fixed, so it is extremely safe even under constant load conditions such as earthquakes and typhoons during the construction period. There is.

In addition, since the construction method involves integrating the bridge body with the piers, it is possible to partially construct the truss structure using a composite structure of steel and concrete, which allows for a more longitudinal design when installing members. can be done.

Further, according to the method of the present invention, there is no need to use expensive shoes, so construction costs can be reduced, and various other advantages can be obtained compared to the conventional overhang construction method.

[Brief explanation of drawings]

Fig. 1 is a front view showing an example of a bridge constructed by the method of the present invention, Fig. 2 is a front view showing another example of the bridge, and Figs. 3 to 5 (A>, <8) are A partial front view showing an example of the structure of a connecting part of a bridge pier, Figures 6 to 9 are diagrams of group 1 without showing the construction order, and Figures 10tM to 12 are T explanatory diagrams showing the conventional overhang construction method. . 1... Bridge abutment, 2... Pier, 4... Bridge body, 7...
Composite member of steel and concrete 1-, 8...Top chord material, 9-
...Lower chord member, 10... Diagonal member, 11... Upper chord member connection part, 12... Lower chord member connection part, 13... Diagonal member connection part, 1
4... Steel column, 15°16... Anchor bolt. Applicant's agent Sato - Male - J3 design 4 figures % 6 figures Figure 7 Figure 5P18 Figure 9Py00 Figure Most 11 figures Procedural amendment 1988 (Display of 11 cases on March 18, 1988 Patent application No. 32203 2 Method of building a bridge with the name of the invention 3 Relationship with the case of the person making the amendment Patent applicant Co., Ltd. Miyaji Iron Works 4 Agent I JL+ 7 “Detailed explanation of the invention” in the amended specification and drawings. 7. Contents of the amendment (1) “Large span” in the second line from the bottom of page 1 of the m disciple for the present application.
is corrected to "large span." (2) "Cable erection method" on page 2, line 7 of the above is corrected to "bent type erection method." (3) From the 3rd line to the bottom line from the bottom of the same page, replace “(Publication Civil Engineering Construction Method...Refer to Sankaido Publishing)” with “(Publication,
(See Steel Road Bridge Construction Handbook, published by Japan Road Association)
I am corrected. (4) Corrected "compression force" in the second line from the bottom of No. 4 above as "compression force". (5) The drawings “Figure 11” and “Figure 12” will be corrected as shown in the attached sheet.

Claims (1)

[Claims] The bridge body is a truss structure made of members mainly made of steel, and the piers are made mainly of concrete. The bridge body is fixed and completed on the left and right sides of the pier, and the bridge body is rigidly integrated with the pier by sequentially connecting and extending each component of the bridge body to the connecting parts that are completed on the left and right sides of the pier. Construction method.